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Primary Biological Aerosol Particles: an important part of the global organic aerosol budget?

Primary Biological Aerosol Particles: an important part of the global organic aerosol budget?. Colette L. Heald and Dominick V. Spracklen. GEOS-Chem User’s Meeting April 7, 2009. FIRST… SOME INTRODUCTIONS. Bonne Ford, graduate student. Gena Renninger, graduate student.

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Primary Biological Aerosol Particles: an important part of the global organic aerosol budget?

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  1. Primary Biological Aerosol Particles: an important part of the global organic aerosol budget? Colette L. Heald and Dominick V. Spracklen GEOS-Chem User’s Meeting April 7, 2009

  2. FIRST… SOME INTRODUCTIONS Bonne Ford, graduate student Gena Renninger, graduate student Kateryna Lapina, postdoc

  3. PRIMARY BIOLOGICAL AEROSOL PARTICLES (PBAP) ALGAE VIRUSES BACTERIA POLLEN FUNGUS PLANT DEBRIS Jaenicke [2005] suggests may be as large a source as dust/sea salt (1000s Tg/yr) Elbert et al. [2007] suggest emission of fungal spores ~ 50 Tg/yr

  4. CURRENT SOURCE ESTIMATES FOR ORGANIC AEROSOL (Tg/yr) WITHOUT PBAP WITH PBAP? PBAP estimates ~1000 Tg/yr would swamp all other sources of organic aerosol. Fungal spores emissions equivalent to biomass burning? Budget #’s from GEOS-Chem [Park et al., 2003; Henze et al., 2008]

  5. PBAP ACROSS THE SIZE RANGE? PM2.5 May also make important contribution to fine mode aerosol Dominates the coarse mode (pollens, debris…) From Andi Andreae (unpublished data)

  6. GEOS-CHEM SIMULATION OF FUNGAL SPORE PBAP I. Identify tracer to test simulation: Mannitol is a unique tracer for fungal spores [Bauer et al., 2008; Elbert et al., 2007] 1 pg mannitol = 38 pg OM* II. First-guess: constant emissions from Elbert et al. [2007], with 20% in fine mode III. Optimize emissions: Test meteorological drivers to reproduce observed variability Constant Emission Optimized Emission = f(LAI, H2O) VAST improvement for fine PBAP: capture variability, unbiased simulation MODEST improvement for coarse PBAP: relatively unbiased, but other drivers?

  7. WHERE ARE FUNGAL SPORES AN IMPORTANT SOURCE OF ORGANIC AEROSOL? Generally contribute ~10% to fine mode surface OA, but > 30% in tropics

  8. WHEN ARE FUNGAL SPORES AN IMPORTANT SOURCE OF ORGANIC AEROSOL? Hyytiala GEOS-Chem simulation unpublished data, Hanna Manninen Taiwan [Ho et al., 2005] Pronounced seasonality in extratropics (corresponding to vegetation cover), peaking in late-summer/fall as in measurements. Porto, Portugal [Sousa et al., 2008]

  9. CONCLUSION FINE OA SOURCES COARSE OA SOURCE (Tg yr-1) (Tg yr-1) Fungal spores make a modest, but regionally important contribution to organic carbon aerosol budget. More observations needed to test… What about other PBAP types? Next up: implications for CCN (using GLOMAP model…) [Heald and Spracklen, GRL, in press]

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